Car-roof construction.



J. J. HOFFMAN.

OAR ROOF CONSTRUCTION. APPLIGATION FILED AUG. 20. 1910.

993,600. Patented May 30,1911.

messes Mg m To all whom it may concern:

obviate the chafing UNITED STATES PATENT OFFICE.

JOHN J'. HOFFMAN, OI NEW KENSINGTON, PENNSYLVANIA, ASSIGNOR TO PETER H. MURPHY, 0F IPI'I'TSBURG, PENNSYLVANIA.

GARe-IBOOIE CONSTRUCTION.

Specification of Letters Patent. Patented May 30,1911.

bpplicatlon'flled August 20, 1910. Serial No. 578,206.

Be it known that I, JOHN J. HOFFMAN,

of New Kensington, county of Westmoreland, and State of Pennsylvania, have invented anew and useful Im rovement in Car-Roof Construction, of w ich the following is a full, clear, and exact description, reference bein had to the accompanying drawings, whic form part of this specification.

This invention relates to car roof construction and more particularly to that type employing metallic sheets which are faste'ned to the car siding by means of suitable clips, which are secured tothe crown mold or facia and extend up and overlie the edges of the -sheets.

The primary object of the invention is to of the clips on the sheet at this point. This chafing is occasioned by the clip binding upon the sheetsincident to the sheet movement due to weaving of the car and sheet expansion and contraction,-

and engenders rusting of the sheet, which rusting is an mentedby the moisture retainin cinders arbored by the clip.-

. y invention consists in providing a novel .form of construction in which is obviated the binding of the clip directly upon the bod ma e for the free circulation of air between the clip and roof to free the device from cinders, and for reinforcement of the roof sheet at points lying within and about the zone of the cli s.

I will "now describe my invention so that others skilled in the art to which it appertains' may understand. and construct the same, referring to the accompanying draw-- ings in which I have shown one embodlment of my invention. It will, however, be apparent that the construction shown ad; mits of greatsmodification without departin from my invention.- 3

igure'*1'--is --e transverse vertical section .throu h, the side edge of a car roof, showing t e car siding, side plate, facia, and

.roof sheets; and Fig. 2 is a sectional per-' spective view of the same. In describing my invention, the reference of the sheet and in which provision s the free circulation of-air beneat numeral 2 indicates the siding, 3 the facia, 4 the side plate and 5 a roof sheet of a car of ordinary construction.

The employment of securing clips of the character above mentioned is enerally in connection with roof COHStIHCtIOII employing metallic plates 5 which are united at their edges by a suitable flexible seam and are capable of moving l'ongitudinallyand transversely of the roof; the clip serving to not only prevent the sheet from rising at the edge but also to resist by a suitable close fitting, undue movement of the sheets. in order not to impair the functions of the clip, as above stated, I provide the sheet with the rivet like hearing 6, which, preferably passing through the sheet, has the under face 7 lying substantially flush with the under face of the sheet so as not to bind against the car siding and-resist the move- 9 being, also, secured in the usual manner 120375 thefacia 3, siding 2 and side late 4 by the suitable fastening bolts or nai s 10.

By my'improved construction it will be seen that the clip is prevented from binding The elevation of the shank 8 of the clip from upon the roof sheet and setting up chafing the upper face of the sheet also ermit's of. r

the clip for the removal of cinde'rs. .The member 6 does not call for the s 'ecial formation of the roof sheet and may a plied without impairing its vvater roof qua lty. Further more, the rivet-1 0 member 6 passing through the sheet tends-to greatly stiffen" the sheet at points lying wi in'and about the zone of the clip so that the sheet is effectually held in fiat position at this point where the tendency thereof is to rise and buckle as the sheet, bound to the roof by the clip, moves under expansion and contraction by the operative roof stress.

Other advantages ofvm invention will be appreciatedby those ski ed the art.-

support, a series of bg', a eet and a fastenmg Bupp0rt,'a series of roof 19 by, a rivet-like bearing What I claim and desire to secure by Letters Patent is,

1. In a car roof, the combination of a roof sheets carried them a rivet-1ike bearing piece can'iedby the clip secured to the car and overlying the bearing piece.

the combination of 21 sheets carried therepiece curried by and sidin 2. n a car roof passing through the sheet, and a fastening 011; secured t0 tbs car slohng and overlying the, be?! rmg 131806.

In tastimuny whereof, I have hereunto set my hand.

JOHN J. HOFFMAN. Witnesses M. A. EARTH, M, A. KELLER. 

